Shearing head



Nov'. 17, 1942;

J. H. RAND, JR

SHEARING HEAD Filed Feb. 2l, 1939 INVENTOR J.H.RAND,JR.

ATTOR NEY Patented Nov. 17, 1942 SHEARING HEAD James H. Rand, Jr., Stamford, Conn., assignor to Remington Rand Inc., Bufalo, N. Y., a corporation of Delaware Application February 21, 1939, Serial No. 257,616

8 Claims.

This invention relates generally to the shearing head of a mechanical shaver and more particularly to hair tripping devices which may be embodied in said head.

Hair tripping devices of varying kinds have been disclosed in the prior art and the value of these devices, as an aid to shaving, has long been recognized. The hair tripping devices of the present invention may be applied, with particular advantage, to the type of shaver having a xed shear plate and a relatively movable cutter. In one embodiment of the invention disclosed herein, the hair tripping devices are shown formed directly upon the inner cutter and there is thus obtained, a novel and unusually eiective tripping action.

One of the objects of this invention is to provide hair tripping means on shearing heads that will raise hairs to a substantially upright position and thereby facilitate a proper contact with the shearing elements of a Shaver. Such hair tripping means may be formed on either or both of the shearing members and may be either integral with the shearing members or not.

Other objects and structural details of this invention will be apparent from the following description thereof, when read in conjunction with the accompanying drawing in which Fig. 1 is a side elevational view of a shearing head with a portion of the outer shear plate broken away to show the inner cutter and the hair tripping device formed thereon;

Fig. 2 is a view in cross section taken substantially along the line 2-2 of Fig. l, and shows the hair tripping means formed on the inner cutter and a section of the skin surface with hairs being tripped and raised;

Fig. 3 is a side elevational view of another embodiment of this invention, wherein the hair tripping devices are formed on the xed outer shear plate of a shaver;

Fig. 4 is a view in cross section taken substantially along the line 4-4 of Fig. 3v.

Like characters of references refer to like parts in all the drawings.

Shearing heads I5 of well known types are disclosed in all the drawings. These shearing heads are adapted to be removably secured to a casing I! partly shown, being so secured by a set screw I2. Casing II encloses a well-known motor of which only the driving lever I 3 is shown (Fig. 2).

Shearing head I0 comprises an outer shear plate I4 and an inner cutter I5 reciprocally stantially semi-circular in shape and has a channel I6 within which inner cutter I5 is mounted. The upper surfaces I 'I and I8 of each of the shearing members I4 and I5 respectively have cutting elements formed therein, which elements may be formed by either slots or perforations, or both.

Figs. 1 and 2 disclose hair tripping means on inner cutter I5. They are in the form of deep longitudinal cutouts or V-shaped grooves I 8 on one or both sides of said cutter, said grooves being adjacent the cutting surface thereof so that a trip bar 20 is formed between each groove I9 and cutting surface I8. The cutting surface I I of the outer shear plate I4 within which inner cutter I5 is mounted is formed with slots 23 that extend over and beyond trip bars 20, while element I5 is formed with coacting slots 2|.

Figs. 3 and 4 disclose hair tripping means of a similar formation as in Figs. 1 `and 2, only that they are formed on the outer shear platel I4. They are formed by a deep cutout or V- shaped groove 22 on each side of said shear plate adjacent but in advance of slots 23 formed thereon. The cutout'or groove 22 thus forms a trip bar 24 between each groove 22 and slots 23.

Fig. 2 discloses the operation of trip bar 20 in inner cutter I5. Upon passing the razor over the face, hairs H penetrate slots 23 of outer shear plate I4, and then are tripped and raised by trip bar 20. In other words, the hairs H are raised with engagement with the upper wall of groove I9, which wall forms an inwardly extending ledge along the lower side of bar 20. In this way flattened hairs are brought to a substantially upright position for proper and eiective contact with the cutting elements of both shearing members.

In Figs. 3 and 4, the hair tripping device in the form of trip bar 24 is on the outer shear plate I4 and is in advance of,and adjacent to slots 23 formed thereon. Likewise, the hairs H are raised in this form by engagement with the upper wall of groove 22, which wall forms an inwardly extending ledge along the lower side of the bar 24. Thus, as the razor is passed over the face trip bar 24 raises the hairs for proper entry into slots 23.

While there are above described but a limited number of embodiments of the invention, it is possible to produce still other embodiments without departure from the inventive concept above disclosed, and it is, therefore, desired that onli mounted therein. Outer shear plate I4 is sub- 65 such limitations shall be imposed on the appended claims as are stated therein, or required by the prior art.

What I claim as new, and desire to secure by Letters Patent, is:

l. A dry shaving head comprising inner and outer cutters, each having slots forming cutting surfaces, and a continuous hair lifting ledge eX- tending longitudinally of one of said cutters at each side of the cutting surfaces thereof,l said ledge having at least one longitudinal side disposed substantially at right angles to said cutting surfaces of the inner and outer cutters.

2. A dry shaving head comprising relatively movable inner and outer cutters, each having cooperating cutting edges, and continuous longitudinal hair lifting ledges on one of said cutters, said ledges having longitudinal side portions disposed substantially at right angles to said cutting edges at each side thereof for raising hairs to a cutting position.

3. A dry shaving head comprising a curved outer cutter having a longitudinal row of cutting elements, a curved inner cutter movable longitudinally Within the outer cutter and having a longitudinal roW of cutting elements coacting with the cutting elements of said outer cutter, and continuous longitudinal hair lifting ledges on one of said cutters disposed at opposite sides of the cutting elements thereof, said ledges having longitudinal side portions disposed in planes extending substantially radially of the curvatures of saidcutters.

4. A dry shaving head comprising a slotted outer cutter, a slotted inner cutter mounted for movement therein, and continuous hair lifting ledges extending longitudinally of said inner cutter, said ledges being disposed at opposite sides of the slots of said inner cutters and having edge portions extending inwardly at right angles to the outer surface of said inner cutter for raising hairs to a cutting position.

5. A dry shaving head comprising a slotted outer cutter, an inner cutter mounted for movement in said outer cutter and having slots forming cutting edges, and a continuous bar extending longitudinally of said inner cutter at each side of said slots, said bar having a longitudinal side portion extending inwardly at right angles to the cutter surface to form a continuous ledge for raising hairs to a cutting position.

6. A dry shaving head comprising a slotted outer cutter, a slotted inner cutter mounted to move therein, the slotted portion of the outer cutter extending beyond the slotted portion of the inner cutter, and a continuous hair lifting ledge formed in said inner cutter beneath the slotted portion of the outer cutter, said ledge being formed by a substantially V-shaped groove extending longitudinally of said inner cutter with one Wall thereof disposed substantially at right angles to the surface of the cutter.

'7. A dry shaving head comprising an outer cutter having slots forming cutting edges, a slotted inner cutter mounted for movement in said outer cutter, and a continuous bar extending longitudinally of said outer cutter at each side of said slots therein, said bar having a longitudinal side portion extending inwardly at substantially right angles to the cutter surface to form a continuous ledge for raising hairs to a cutting position.

8. A dry shaving head comprising a slotted outer cutter, a slotted inner cutter mounted to move therein, and a continuous hair lifting ledge formed in said outer cutter adjacent the slotted portion thereof, said ledge being formed by a substantially V-shaped groove extending longitudinally of said outer cutter with one wall thereof disposed substantially at right angles to the surface of the cutter.

JAMES H. RAND, JR. 

